The no-armed bandit showed up in one of the cleverest, or most unlikely, spots in the Riviera Hotel Casino, depending on how you look at it. Why the dichotomy? It was positioned in a rare location not watched by a security camera. The flipside? It was right outside the casino's security office.

Markus said it was clear to him the ATM was fake when he looked at the smoked glass on the front of the machine and noticed something funny about it. When he beamed a flashlight through the glass, instead of seeing a camera behind it, he saw the PC that was set up to siphon card data.

The illicit Riviera ATM wasn't the only one found in Vegas this week. PC World reports that the Secret Service is investigating reports of hacked ATMs across the city. At the Rio All-Suites Hotel and Casino DEFCON presenter Chris Paget reported trying unsuccessfully to withdraw cash from one, but still having his account debited.

He wasn't the only one. Paget spoke with an Israeli man who had tried to withdraw $1,000, as well as a woman who tried to take out $400. At least a half dozen people experienced the same problem at various machines in the hotel, Paget said.